Firefox 21 Beta has been released and available for testing with new features like three states of UI for Do Not Track, ability to restore all removed thumbnails from most controversial New Tab Page and Health Report has been preliminarily implemented which has been already available on Nightly and Aurora builds.

Viewing Firefox health Report

To open Firefox health report, click on Firefox button and then hover mouse oven Help Submenu and select “Firefox Health Report” or type “about:healthreport” (without quotes) in the address bar and press enter.

If you’ve visited Health Report on first day, bottom of page shows tip to come back after couple of weeks to see more trends.

FYI, Firefox Beta comes with Data Sharing/Health Report turned on by default for browser, which means Firefox sends Raw data to Mozilla servers. If you’ve any Privacy concerns, you can turn off data sharing or disable Firefox Health Report, then all data Mozilla received will be deleted from their servers after 180 days.

Disabling Firefox Health Report/stop data sharing with Mozilla

I. From Firefox Health Report page, click on Data Sharing button which is on to turn it off.

II. You can also turn off Data sharing by disabling Firefox health report, for that

If you disable submission of the FHR data, the client will immediately send a request to the server to delete the previously submitted data (if there is any). This request is processed immediately.

The 180 days is how many days of data the installation stores locally for analysis by the user and submits to the server. If the installation stops submitting but does not opt-out, then the last submission will remain on the server for 180 days before being deleted.